Show RADIO DEVICE LOCATES SHIPS Measure Depth a aid d Distance Dis Distance tance From Land By Wireless SEATTLE July VP 2 2 W Equip Equipped ped with a radio position finder and a sonic depth measurer the tho steamer Guide of the Unites United States Coast and Geodetic lurve survey which has recently entered upon the task of mapping the tho waters off the Pacific coast to a depth of oC 1 fathoms was aas pronounced In Inthe inthe Inthe the offices of the survey here the most mort up to teasel for her work ork In the world The devices on the Guide grew out of operative co-operative efforts to com com- combat com combat bat the tho submarine In the tho world ear ar These Thee efforts engaged the army the tho navy and many man Amer- Amer Amerlean Amer American lean ican civilian electricians The study has been continued since the tho war ear particularly by the cot coast artillery corps of the army The Sound Laboratory ot of the Bureau of Standards de the ape ap- apparatus ap apparatus used by tho the Guide to de- de determine determine de determine termine her position Knowledge Knowledge of oC the transmission ot of sound gained In lit these thele efforts and applied aboard the GuIdo Guide her commander to deter doter mine her position and the depth ot of the water In her vicinity with with- without without out leaving her radio room EXPLODE BOMB BOffi BO rB To get the tho position of o the Guido Guide Guidea a small TNT bomb Is ii exploded astern 20 feet under the surface or of the hater oter This Is done elec elec- elec The sound wave set In motion by the explosion In enlarging circles Wl en this wale wae wa e reaches a h a device 60 feet under the surface of the water and about half a amile amile mile from shore to which a Cable run runs the sends a 0 signal ashore and a shore sta- sta station sta station tion automatically sends send a radio signal to the Guide ng from the tho speed ot of travel of the tho sound the corn com comm minder m of or the Guide quickly de- de determines determines de determines his distance from the shore station And d determining his distance from two stations he knows his position The task tuk taken up by the Guide and on which she I Is le to work In the summer off ort Oregon and Washington and aDd In winter Inter off CaliforniA was wa dropped la In au 1922 auby by the Lydonia |